documentation (commiting now from Guadeloupe)

Visitor/Role.php

@@ -9,13 +9,14 @@ namespace DesignPatterns\Visitor;
  * The Visitor Pattern lets you outsource operations on objects to other objects. The main reason to do this is to keep
  * a seperation of concerns. But classes have to define an contract to allow visitors (the "accept" method in the example below).
  * 
- * The contract is an abstract class but you can have also a clean interface
+ * The contract is an abstract class but you can have also a clean interface. 
+ * In that case, each Visitee has to choose itself which method to invoke on the visitor.
  */
 abstract class Role
 {
 
     /**
-     * This method handle a double dispatch based on the shortname of the Visitee
+     * This method handles a double dispatch based on the shortname of the Visitee
      * 
      * Feel free to override it if your object must call another visiting behavior
      * 

Visitor/RolePrintVisitor.php

@@ -5,16 +5,22 @@ namespace DesignPatterns\Visitor;
 /**
  * Visitor Pattern
  *
- * An implementation of a Visitor
+ * An implementation of a concrete Visitor
  */
 class RolePrintVisitor implements RoleVisitor
 {
 
+    /**
+     * @inheritdoc
+     */
     public function visitGroup(Group $role)
     {
         echo "Role: " . $role->getName();
     }
 
+    /**
+     * @inheritdoc
+     */
     public function visitUser(User $role)
     {
         echo "Role: " . $role->getName();

Visitor/RoleVisitor.php

@@ -5,13 +5,19 @@ namespace DesignPatterns\Visitor;
 /**
  * Visitor Pattern
  *
- * The contract for the visitor
+ * The contract for the visitor.
+ * 
+ * Note 1 : in C++ or java, with method polymorphism based on type-hint, there are many
+ * methods visit() with different type for the 'role' parameter.
+ * 
+ * Note 2 : the visitor must not choose itself which method to
+ * invoke, it is the Visitee that make this decision.
  */
 interface RoleVisitor
 {
 
     /**
-     * Visit a user object
+     * Visit a User object
      * 
      * @param \DesignPatterns\Visitor\User $role
      */